Tread portion of an automobile tire



FIG. 1 is a perspective view of the top, front and right side of a tread portion of an automobile tire, it being understood that the tread pattern repeats itself uniformly throughout the circumference of the tire, showing my new design;

FIG. 2 is a front elevational view thereof, the top plan view, bottom plan view and rear elevational view being identical thereto;

FIG. 3 is a left side elevational view thereof, the right side elevational view being identical thereto;

FIG. 4 is an enlarged fragmentary front elevational view thereof; and,

FIG. 5 is an enlarged cross-sectional view taken along the line 5—5 in FIG. 4 thereof.

The elements shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 